Paper container for fluid



Dec. 6, 1938. M. H. SIDEBOTHAM PAPER CONTAINER FOR FLUID Filed Oct. 4, 1935 4 Sheets-Sheet 1 Dec.- 6, 1938. SlDEBOTHAM 2,139,626

PAPER CONTAINER FOR FLUID Filed 001;. 4, 1935 4 Sheets-Sheet 2 Dec. 6, 1938. SIDEBOTHAM 2,139,626

PAPER CONTAINER FOR FLUID Filed Oct. 4, 1935 4 Sheets-Sheet 3 Ila -------------------------- v u r 1 1 fnvenfor Ne/v/h /7. 5158170272007 5% W Af/arney Dec. 6, 1938. M. H. SIDEBOTHAM 2 PAPER CONTAINER FOR FLUID Filed Oct. 4, 1935 4 Sheets-Sheet 4 Fig/5 ullll'lllllll J M. MM

Patented Dec. 6, 1938 i'i'ED PAPER CONTAINER FOR FLUID Melvin H. Sidebotham, West Newton, Mass, as-

sig'nor to Specialty Automatic Machine Company, Medford, Mass, a corporation Application October 4, 1935, Serial No. 43,499

2 Claims.

The invention relates to paper receptacles and the manufacture thereof and has particular reference to the production of receptacles for handling measured quantities of fluid, such as milk, to provide economical substitutes for the glass bottles usually employed. It is to be understood however that my improved containers may be employed for holding oil, ground salt, flour and other easy flowing substances.

Glass bottles, such as those used for containing milk, are subject to the constant hazard of breakage, besides requiring Washing and sterilization at every period of refilling. At the present time, milk bottles are so expensive that a deposit is usually charged for their use, and much care must be exercised in their storage so that the investment represented by the deposit fees will not be lost due to breakage. And there are other wellknown objections to the employment of glass bottles for such wide distribution as is necessary to meet the requirements of dairy business.

One of the objects of my invention is to produce fluid containers which are not only so economical in cost of production that their preservation after a single use need not be considered, but are also strong enough to stand the usual force employed during handling and transportation whether filled or empty.

Another object of my invention is to provide containers which may be stored without waste of storage space; this is accomplished by my containers which are angular in cross-section.

Another object is to meet the growing tendency toward scientific household equipment, by providing convenient units for storage in modern electric refrigerators.

Another object of my invention is to provide a method of manufacture by which the end closures of a receptacle are sealed by external pressure, without the necessity of a former or tool being used on the inside of the receptacle.

With said objects in View, and others hereinafter explained, the invention consists in the form and structure and method for the production of the containers substantially as hereinafter described and claimed.

Of the accompanying drawings:

Figure 1 is a perspective view of one of my improved containers showing top end closure partly broken away and omitting the cover strip.

Figure 2 is a planyiew of the blank which provides the body of the container.

Figure 3 is a top view of the blank shown in Figure 2.

Figures 4 and 5 are plan views of the blanks which provide the top and bottom closures of the container.

Figure 6 is a view similar to the-upper portion of Figure 1, and includingthe cover strip.

Figure 7 is a plan view of the blank which a provides the cover strip.

Figure 8 represents a section, enlarged on line 8-8 of Figure 1.

Figure 9 is a plan view of device which may be used in the method for forming and applying adw hesive to end closure blank and pressure means for sealing end closures to the body of the receptacle, showing unformed end closure blank in place.

Figure 10 represents a section on line ill-ill of Figure 9 showing unformed end closure blank in place.

Figure 11 represents a partial section on line l @-l@ of Figure 9 showing the end closure forming means in position in contact with end closure blank,

Figure 12 represents a partial section on line 89-99 of Figure 9 showing means in operation for applying adhesive to partly formed end closure blank. U

Figure 13 represents a section on line iii-i9 of Figure 9 showing body structure of receptacle assembled with end closure member and showing means in operation for applying external pressure to secure together said body structure and end closure.

Figure 14 represents a horizontal section below top platform of frame 39 showing operating device for applying pressure to seal end closures of receptacle with body structure. 5

Figure 15 is an elevation view of partly folded body structure.

Figure 16 is a plan view of partly folded body structure shown in Figure 15.

Figure 17 is an elevation view of body structure folded to fiat condition with side portions overlapped.

Figure 18 is a plan view of Figure 1'7 showing body structure folded to flat condition.

Figure 19 is an elevation view of body structure shown opened to tubular condition.

Figure 20 is a plan view of body structure shown in Figure 19.

Similar reference characters indicate similar parts or features in all of the views.

The body l2 consists of a rectangular sheet of suitably stiff paper or fiber board. As illustrated in Figure 2, it is transversely creased on lines to enable it to be folded to present walls of a body which is square or angular in cross-section. One 5 of said walls consists of the overlapping sections l3, It, the latter having a marginal portion or lip l5 which is oil-set from the plane of the body blank as illustrated in Figure 3. Such oft-setting is efiected prior to folding the blank to tubular form so that, as illustrated in Figure 1, the edge of the section it will closely abut, or fit into, the recess betweensecticns id, id, resulting from the oifsetting of the blank, when said blank i. converted to condition to provide the body of the container.

The upper end closure oi the container consists of a fiat rectangular memmr it having an. opening H and provided with four marginal portions 88 each of which is widened at its midlength as indicated at is in Figure 4. As also illustrated in Figure 4, the portions it are creased marginal portions 18 are formed somewhat V-' shaped. In other words, the adjacent and edges of the members Id, at each corner, are not at a right-angle, but are at an angle somewhat less than 90 degrees. The object of this formation is to provide leak-tight corners at the top, due to the fact that when the marginal portions l8 are folded over the top edges of the walls of the body, the adjacent end edges at a: of said portions iii are crowded tightly together.

The bottom closure of the container is similar to the top one, but has no opening. As illustrated in Figure 5, it comprises a rectangular fiat member 28 provided with ioldable marginal portions 2! having widened portions 22. And it, also, has

recesses m at the corners. And it is secured to the bottom of the body in the same manner as has been described in connection with the top closure.

To close the opening ll in the top member I6, I provide a strip 23 having one end 24 pointed (Figure '7) and out near said pointed end to pro vide a liftable tongue or flap 25. The other end of said strip 23 is cut to provide portions 26, 271 which are creased in right-er directions so thatwh'en applied to position for use (Figure 6) the portions 26, 21 are foldable over the folded portions 58 of the top member at one corner of the latter. To ensure a tight permanent retention of the strip 2b in the position shown in Figure 6, its toldable portion :1 is provided with an extension or tongue 28 which, after the portion 26 has been folded to set position, is then carried over and secured to'the outer surface of said folded portion In some instances it is preferable to fold and form the cover strip to complete condition before assembling it to the top closure.

This securing of the strip to the top of the container where there are three thicknesses of material due to the presence of the over-folded members 98, and at a corner thereof, ensures permanency of position. And owing to the pointed end 26 of the strip extending snugly into a, corresponding re-entrant angle, there is practically no liability of the strip becoming displaced from operative position. From this it will be understood that it is important to have theplane of the closure is below the plane of the upper edges of the body of the container.

I have shown in the accompanying drawings a preferred embodiment of my invention, but the form of my improved container may vary, from the form shown, without departing from the spirit my invention. The container illustrated has a four-sided body structure, but the body structure may be triangular or polygonal in cross-section; also the said body structure may be larger at the bottom than at the top. I

have shown a vertical lap-joint as the means for connecting the sides oi the body-blank to form the body structure, but any known means may be used to effect the connecting oi? the sides of said body-blank, without departing from the spirit of my invention.

A preferable way or method to convert the blank 12 (Figure 1) and the end closure blanks l6 and 20 (Figures *1 and and the cover strip 23 (Figure 'l) to form and condition to provide a complete container will now be described:

Apply an adhesive to the surface of section 15 of body blank I2 (Figure 2); partly fold sections 48 and I of body blank it towards each other (Figure 15); complete the folding of said sections II and ll of body blank 12 to a fiat condition with section i5 overlapping section I 8 (Figure 17); lpply pressure to the folded body blank ii toseal adhesive treated section H5 to section 03; open the folded and sealed body blank l2 (Figures 1"!) to a tubular condition (Figures 19 and 20),. The bottom and closure 20 (Figure 5) is formed and secured to the tubular body structure as follows: The end closure blank 20 is fed to a forming, gluing and sealing device (Figures 9 and 10) having a frame at supporting slidable pressure and registering lugs M, 32, 38 and 34, (Figures 9 and 10). The end closure blank 29 is then acted upon by forming knives 36 (Figure ll) mounted in forming head which is pivotally mounted on pins 59 and 40 supported by frame 3%; the forming head 35 is then raised from contact with the end closure blank 29; the head 37, supporting glue applicator 3B, is then pivoted about pins M and 42, mounted in frame so, to contact said blank 29 (Figure 12) and thereby deposit glue or other adhesive to the surfaces 29 of said blank 20 (Figure 5); the head 31 is then raised from contact with end closure blank 29; the open end of tubular formed body structure i2 (Figure 19) is then inserted into the adheslvely treated recesses formed in end closure blank 20 (Figure 13); the end closure 28 is sealed to the body structure it by means of pressure applied externally on said end closure; the sealing pressure is eiiected by the converging action of pressure members M, 32, 33, 3 3 which firmly press the adhesively treated folded sections of end closure blank to the end of body structure it; the pressure members 39, 82, 3t, 3d are controlled by lever 48 (Figure 13) pivoted on pin dd supported by frame lugs 65; said lever 43 acts through pin 46 on bracket 6'! having pins 53 supporting ends of links 49 having plus $6 connected to ends oi levers 553 pivoted on pins 5i mounted in frame 38, said levers 555 have pins 52 mounted thereon and connected to pressure members 3|, 32, 88, 34.

While means and method are here shown for forming and assembling the bottom end closure with the lower end of body structure, the same means and method may be used to efiect assembly of the top closure with the top end of body structure. It is apparent from the above description of the method that both top and bottom closures may be formed and assembled with the body structure simultaneously.

In assembling cover strip 23 adhesive is applied to the portions 26 and 21 thereof (Figure '7) said portions 26 and 21 are then folded over the top end closure, as previously described and as shown in Figure 6. In practice no adhesive is applied to the widened areas I9, 22, of the margins of the end closure blanks, because those areas may be utilized for holding and registering during the folding and pressing operations.

To render the container liquid or fluid proof, any suitable treatment may be employed, such as completely coating it with parafflne.

To fill the container with milk or other fluid the cover strip 23 may be flexed and lifted suf ficiently to expose the opening l1 and the fluid then poured in through said opening. By applying suitable adhesive to the strip 23, it will be retained in place, without risk of becoming displaced. This security of position is due to its being in a plane below the top edges of the body, and to its pointed end 24 entering an angular recess provided by reinforced top edges of the body walls.

Having now described my invention, I claim:

1. The process of making a paper container which comprises the creasing of a rectangular blank, applying an adhesive to a side edge thereof, folding the edges of the blank so that the adhesively treated edge overlaps the opposite edge of the blank, applying pressure externally on the folded blank to permanently seal the overlapped edges thereof, opening the folded blank to tubular condition, forming two rectangular blanks to provide end closures for the body,

said end closure blanks having foldable marginal portions projecting therefrom, the ends of said marginal portions being separated from each other by V-shaped spaces, said V-shaped spaces being formed by making an acute angle cut-out at each corner of the blank, folding the marginal portions to provide recesses, applying adhesive to the recessed portions of the end closures, assembling the end closures to the ends of the body structure and permanently sealing the said ends to the body structure by externally applied pressure.

2. The process of making a paper container, which comprises the creasing of a rectangular blank, applying adhesive to a side portion thereof, folding the edges of the blank'so that the adhesively treated edge overlaps the opposite edge of the blank, applying pressure externally on the folded blank to permanently seal the overlapped edges thereof, opening the folded blank to tubular condition, forming'a rectangular shaped blank to provide an end closure for the body structure, said end closure blank having foldable marginal portions projecting therefrom, the ends of said marginal portions being separated from each other by V-shaped spaces, said V-shaped spaces being formed by making an acute angle cut-out at each corner of the blank, folding the marginal portions to provide recesses, applying adhesive to the recessed portions of the'end closure, assembling the end closure to the body structure by inserting the end of said body structure into the recesses of the formed end closure and applying pressure externally to permanently seal said parts together.

MELVIN H. SIDE'BOTHAM. 

